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author | Andy Polyakov <appro@openssl.org> | 2008-12-23 11:33:01 +0000 |
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committer | Andy Polyakov <appro@openssl.org> | 2008-12-23 11:33:01 +0000 |
commit | 5d48a66a6a4bc27b54d32721f7183077489c2e5f (patch) | |
tree | 27b158f856e0636bf349375c047a38b1fc97ee7c /crypto/aes/aes_cfb.c | |
parent | 63fc7f848d4e047c3bd0f4a1c7e843191b2e9f0a (diff) | |
download | openssl-5d48a66a6a4bc27b54d32721f7183077489c2e5f.tar.gz |
Engage crypto/modes.
Diffstat (limited to 'crypto/aes/aes_cfb.c')
-rw-r--r-- | crypto/aes/aes_cfb.c | 179 |
1 files changed, 4 insertions, 175 deletions
diff --git a/crypto/aes/aes_cfb.c b/crypto/aes/aes_cfb.c index b085316941..0c6d058ce7 100644 --- a/crypto/aes/aes_cfb.c +++ b/crypto/aes/aes_cfb.c @@ -49,23 +49,8 @@ * */ -#ifndef AES_DEBUG -# ifndef NDEBUG -# define NDEBUG -# endif -#endif -#include <assert.h> - #include <openssl/aes.h> -#include "aes_locl.h" -#include "e_os.h" - -#define STRICT_ALIGNMENT -#if defined(__i386) || defined(__i386__) || \ - defined(__x86_64) || defined(__x86_64__) || \ - defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) -# undef STRICT_ALIGNMENT -#endif +#include <openssl/modes.h> /* The input and output encrypted as though 128bit cfb mode is being * used. The extra state information to record how much of the @@ -76,177 +61,21 @@ void AES_cfb128_encrypt(const unsigned char *in, unsigned char *out, size_t length, const AES_KEY *key, unsigned char *ivec, int *num, const int enc) { - unsigned int n; - size_t l = 0; - - assert(in && out && key && ivec && num); - - n = *num; - -#if !defined(OPENSSL_SMALL_FOOTPRINT) - if (AES_BLOCK_SIZE%sizeof(size_t) == 0) { /* always true actually */ - if (enc) { - if (n) { - while (length) { - *(out++) = ivec[n] ^= *(in++); - length--; - if(!(n = (n + 1) % AES_BLOCK_SIZE)) - break; - } - } -#if defined(STRICT_ALIGNMENT) - if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) - goto enc_unaligned; -#endif - while ((l + AES_BLOCK_SIZE) <= length) { - unsigned int i; - AES_encrypt(ivec, ivec, key); - for (i=0;i<AES_BLOCK_SIZE;i+=sizeof(size_t)) { - *(size_t*)(out+l+i) = - *(size_t*)(ivec+i) ^= *(size_t*)(in+l+i); - } - l += AES_BLOCK_SIZE; - } - - if (l < length) { - AES_encrypt(ivec, ivec, key); - do { out[l] = ivec[n] ^= in[l]; - l++; n++; - } while (l < length); - } - } else { - if (n) { - while (length) { - unsigned char c; - *(out++) = ivec[n] ^ (c = *(in++)); ivec[n] = c; - length--; - if(!(n = (n + 1) % AES_BLOCK_SIZE)) - break; - } - } -#if defined(STRICT_ALIGNMENT) - if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) - goto dec_unaligned; -#endif - while (l + AES_BLOCK_SIZE <= length) { - unsigned int i; - AES_encrypt(ivec, ivec, key); - for (i=0;i<AES_BLOCK_SIZE;i+=sizeof(size_t)) { - size_t t = *(size_t*)(in+l+i); - *(size_t*)(out+l+i) = *(size_t*)(ivec+i) ^ t; - *(size_t*)(ivec+i) = t; - } - l += AES_BLOCK_SIZE; - } - - if (l < length) { - AES_encrypt(ivec, ivec, key); - do { unsigned char c; - out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c; - l++; n++; - } while (l < length); - } - } - *num = n; - return; - } -#endif - - /* this code would be commonly eliminated by x86* compiler */ - if (enc) { -#if defined(STRICT_ALIGNMENT) && !defined(OPENSSL_SMALL_FOOTPRINT) - enc_unaligned: -#endif - while (l<length) { - if (n == 0) { - AES_encrypt(ivec, ivec, key); - } - out[l] = ivec[n] ^= in[l]; - l++; - n = (n+1) % AES_BLOCK_SIZE; - } - } else { -#if defined(STRICT_ALIGNMENT) && !defined(OPENSSL_SMALL_FOOTPRINT) - dec_unaligned: -#endif - while (l<length) { - unsigned char c; - if (n == 0) { - AES_encrypt(ivec, ivec, key); - } - out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c; - l++; - n = (n+1) % AES_BLOCK_SIZE; - } - } - - *num=n; + CRYPTO_cfb128_encrypt(in,out,length,key,ivec,num,enc,(block128_f)AES_encrypt); } -/* This expects a single block of size nbits for both in and out. Note that - it corrupts any extra bits in the last byte of out */ -void AES_cfbr_encrypt_block(const unsigned char *in,unsigned char *out, - const int nbits,const AES_KEY *key, - unsigned char *ivec,const int enc) - { - int n,rem,num; - unsigned char ovec[AES_BLOCK_SIZE*2 + 1]; /* +1 because we dererefence (but don't use) one byte off the end */ - - if (nbits<=0 || nbits>128) return; - - /* fill in the first half of the new IV with the current IV */ - memcpy(ovec,ivec,AES_BLOCK_SIZE); - /* construct the new IV */ - AES_encrypt(ivec,ivec,key); - num = (nbits+7)/8; - if (enc) /* encrypt the input */ - for(n=0 ; n < num ; ++n) - out[n] = (ovec[AES_BLOCK_SIZE+n] = in[n] ^ ivec[n]); - else /* decrypt the input */ - for(n=0 ; n < num ; ++n) - out[n] = (ovec[AES_BLOCK_SIZE+n] = in[n]) ^ ivec[n]; - /* shift ovec left... */ - rem = nbits%8; - num = nbits/8; - if(rem==0) - memcpy(ivec,ovec+num,AES_BLOCK_SIZE); - else - for(n=0 ; n < AES_BLOCK_SIZE ; ++n) - ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem); - - /* it is not necessary to cleanse ovec, since the IV is not secret */ - } - /* N.B. This expects the input to be packed, MS bit first */ void AES_cfb1_encrypt(const unsigned char *in, unsigned char *out, size_t length, const AES_KEY *key, unsigned char *ivec, int *num, const int enc) { - size_t n; - unsigned char c[1],d[1]; - - assert(in && out && key && ivec && num); - assert(*num == 0); - - memset(out,0,(length+7)/8); - for(n=0 ; n < length ; ++n) - { - c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0; - AES_cfbr_encrypt_block(c,d,1,key,ivec,enc); - out[n/8]=(out[n/8]&~(1 << (7-n%8)))|((d[0]&0x80) >> (n%8)); - } + CRYPTO_cfb128_1_encrypt(in,out,length,key,ivec,num,enc,(block128_f)AES_encrypt); } void AES_cfb8_encrypt(const unsigned char *in, unsigned char *out, size_t length, const AES_KEY *key, unsigned char *ivec, int *num, const int enc) { - size_t n; - - assert(in && out && key && ivec && num); - assert(*num == 0); - - for(n=0 ; n < length ; ++n) - AES_cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc); + CRYPTO_cfb128_8_encrypt(in,out,length,key,ivec,num,enc,(block128_f)AES_encrypt); } |